RU2049548C1 - Vibration mill - Google Patents

Abstract

FIELD: grinding engineering. SUBSTANCE: mill has housing with outer and grinding cone bearing on the spherical support of the housing through the bearing and spherical journal, unbalance and counterweight. Arresters of vibration of the grinding cone are provided with controllers of vibration amplitude of the grinding cone. They are constricted as rigidly mounted ring. The main and additional arresters are arranged on both sides of the vertical line with respect to the center of gravity of the unbalance and counterbalance. The ratio of the weight of the grinding cone to the weight of the house is greater than 8. EFFECT: improved design. 3 cl, 1 dwg, 2 tbl

Description

 The invention relates to ground technology and can be used to obtain powders of brittle materials for various industries.

Known eccentric crusher containing a bed, a housing, a movable cone, a pipe, an eccentric assembly [1]
The disadvantages of this design are that crushing bodies connected by a kinematic connection exclude the occurrence of vibrational vibrations between them.

Closest to the invention in technical essence is an inertial cone crusher comprising a housing, a crushing chamber formed by an outer cone and an inner cone movable from the drive, supported on a spherical bearing through a bearing. An unbalance is planted on the shaft of the inner cone, and an anti-imbalance on the shaft of the housing having a limiter with a regulator of the amplitude of oscillations of the inner cone [2]
Unlike an eccentric crusher, it has an open kinematic connection between crushing bodies, which helps to reduce specific energy consumption, increase productivity compared to eccentric crushers, all other things being equal.

 The main disadvantage of KID is a wide range of fineness of the crushed product. This is due to the fact that during the operation of the crusher there are natural vibrations of the crushing cone relative to the casing. These fluctuations are not optimal.

 The invention is aimed at obtaining a finely dispersed product with increased accuracy of the grain composition, an increase in technical and economic indicators for specific energy consumption and the degree of grinding of the material.

 The invention differs from the prototype in that it creates a spatial system for restricting the movement of the crushing cone relative to the housing, which takes into account all the features of the action of spatial forces on the crushing cone unbalance system and prevents the occurrence of non-calculated non-parallelism of grinding surfaces during the operation of the crusher. In this case, the vibration limiters are located on opposite sides vertically from the center of gravity of the unbalance and counterbalance, made in the form of a rigidly installed ring, and the ratio of the mass of the crushing cone to the mass of the body is more than 8.

Moreover, the length of the calibration zone l of the crushing chamber is selected within
l = (0.5-0.75) dcos β, where d is the diameter of the conical part of the crushing cone, mm;
β the angle of the generatrix of the crushing cone with its base, deg.

 Such a value of the length of the generatrix of the calibration zone is necessary in order to reduce the non-parallelism of the surfaces of the crushing cone.

 The process of reducing the crushing force due to synchronous oscillatory motion of the housing can be achieved by increasing the mass of the housing. As the mass of the body increases, its oscillations will decrease and, in the limit, with the mass of the body equal to infinity, its oscillations will cease. In this case, the entire velocity value acquired by the crushing cone is realized. In order to achieve this effect without increasing the mass of the vibration mill body, it is placed on the anchor bolts through shock absorbers.

 The drawing shows a vibration mill in section.

 The vibration mill comprises a housing 1 with an outer cone 2 and a crushing cone 3, supported through bearings 4, on which an unbalance 5 with an upper limiter of oscillations of amplitude 6 is mounted, on a spherical support 7 and an anti-balance 8 with a lower limiter of oscillations of the ring 9. In the oscillation limiters, clearance regulators are installed slots 10 and 11.

 The restrictive mechanism is two rings spaced vertically on opposite sides of the center of gravity of the unbalance. The lower ring 9 is rigidly fixed in the unbalance of the housing, and the upper 6 in the unbalance of the crushing cone. The free part of these rings is placed in the grooves 12, made in counterbalance, and the mating surfaces of the rings and grooves are made of the same diameter, and the gap is obtained due to the displacement of the center of the groove. The upper ring is fixed in the unbalance of the crushing cone, and the corresponding groove in the unbalance of the body.

 Preparation of vibratory mills for work is as follows.

 The initial data for the adjustment is the size of the crushed material and hence the amount of clearance.

 In the future, we present data for crushing periclase and obtaining its narrow fraction.

 The size of the crushed product is from 400 to 500 microns. To exclude the free fall of individual pieces through the crushing chamber during one swing of the unbalance, we establish an annular gap between the outer cone 2 and the crushing cone 3 equal to S = 0.75 mm. We adjust the unbalance rolling amplitude controller so that the gap between the cones during operation is kept equal to 0.3 mm. The other control is adjusted to prevent the tipping movement of the unbalance. Then the material is poured into the receiving tank under the blockage, the crusher is included in the work.

 During crushing, not a single point of the grinding body approached the mating grinding body closer than 0.3 mm. The size range of the product being crushed with a sieve residue of less than 5% was 300 μm.

 The technical data of the vibration mill and the results of grinding periclase on it are given in table. 1 and 2.

Claims (3)

 1. VIBRATOR, containing a housing with an outer and crushing cones forming a crushing chamber, unbalance and anti-imbalance, having a limiter with an oscillation amplitude regulator of the crushing cone, made in the form of a rigidly mounted ring, moreover, the crushing cone is supported on a spherical bearing through a bearing and a spherical thrust bearing, characterized the fact that the unbalance is equipped with an additional limiter with a regulator of the amplitude of oscillations, and the main and additional limiters are located on opposite sides vertically from the center of gravity of the unbalance and counterbalance, and the ratio of the mass of the crushing cone to the mass of the body is more than 8. 2. The vibration mill according to claim 1, characterized in that the length of the calibration zone l of the crushing chamber is selected from the ratio
l = (0.5-0.75) d cosβ,
where d is the diameter of the crushing cone, mm;
β the angle of the generatrix of the crushing cone with its base, deg.  3. The vibro-mill according to claim 1, characterized in that it is equipped with anchor bolts, on which the housing is mounted through shock absorbers.

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